Bull-gear dust-shield for tractors



J. L. GOODWIN.

BULL GEAR DUST SHIELD FOR TRACTORS.

APPLICATION FILED SEPT. 15, 1920.

LiQBQ, 1 89,- Patented. July 12, 1921,

1 I I I a u f a a 4 w 4 I Big I4 INVENTOR. Jay L.Gooawin BYQ TTORNEY JAYL. GOODWIN', or STOCKTON, CALIFORNIA, ASSIGNOR or ONE-HALF To WILLIAMTHOMAS, or sroox'ron, CALIFORNIA.

BULL-GEAR DUST-SHIELD non rano'rons.

nasaase.

Specification of Letters Patent;

Application filed September 15, 1920. Serial No. 410,355.

To all whom it may concern:

Be it known that I, JAY L. GoonwIN, a citizen of the United States,residing at Stockton, in the county of San Joaquin, State of California,have invented certain new and useful Improvements in Bull-GearDust-Shields for Tractors; and I do declare the following to be a full,clear, and exact description of the same, reference being had to theaccompanying drawings, and to the characters. of reference .marked,thereon, which form a part of this application.

This invention relates to improvements in keeping dust and dirt outofthe bull gears of tractors employing this type of drive, beingespecially designed and. shown to be used on tractors of the Molinetype.

A dust shield of a sort is provided on these machines, but .it performssomewhat inad+ equately, since while itserves .to keep dust and dirtfrom beingblown or; carried directly onto the face of. the gear, teeth,a

V spaceis left between the outside of the gear and shield of ample sizeto readily allow dust and dirt,to pass therebetween, which will occurwhen the machine is inoperation, especially in dry ground, when a .cloudof dust is constantly hovering around the wheels and naturally siftssooner or later, even through small apertures.

The principal object of my invention is to eliminate this objectionablefeature by providing an absolutely tight shield for. the gear inconnection with the shield already provided, and without necessitatingalterations of any kind being made .on the stand? ard equipment of thetractor.

Another object is to provide a'device for the purpose which may beinstalled or removed without'disinantling the, tractor.

I have alsoprovided two forms of the device, one of which isparticularly adapted 30 be used when ,a dry contact is. desired,

' and the other in connection with lubricating means. ,p

A furtherobject of the invention, isto produce a simple and inexpensivedevice and yet one which will be exceedingly effective for the purposeswhichitis designed.

These objects I'accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

In the drawings similar characters of reference indicate thecorresponding parts in the several views. v

Figure l is a side elevationflo'f a tractor bullgear, detached, showingone form of my improved dust shield installed in connection therewith.

Fig. 2 is an enlarged cross section taken on a line 2-2 of Fig. 1.

Patented July 12,1921.

Fig. 3 is a similar view taken on a line 33 ofFig. 1. V

Fig. 4 is a fragmentary cross section of a bull gear showing a modifiedform of shield. eferring now more particularly to the characters ofreference on the drawings, the numeral '1 denotes the bull gear, theouter side of which is solid throughout its entire area as at 2, thegear beingfixed to its driving wheel by means of integral and radiallypositioned lugs 3. I

The inner side of the bull gear, which in this case is of the internaltype, is of course open throughout to receive the driving pinion (notshown). A dust shield or hood is provided withthe gear as standardequipment,.consisting of a plate 4 spaced somewhat fromthe inner face ofthe gear, and a flange 5 extendingpartlyover the periphery of the gearand concentric therewith, and also spaced somewhat therefrom.

It is on account of this latter spacing that for its, purpose, and

this shield is inadequate propose to remedy it is this defect that Iwith my attachment. 1 This consists of a'hood' comprising a ring 6concentric .with the gearand positioned beyond the shield-flange 5, thegear being stepped down or shouldered at this. point as at 7, the flangebeing spaced sufliciently therefrom toallo-wa flat. strip or gasket offelt 8 or some similar material being placed between the flange andgear-shoulder, and held by lips 9 placed .at intervals .on'the outeredgeof the flange.

An extension 10 from theflange' 6 projects over theshield 5 andconcentric therewith, andisprovided with a'channel 11, whoseopeningfaces the axis of the gear.

This channel is adapted to ,receive and hold a feltring 12, which bearsagainst the. shield 5 sufficiently to prevent the. passage of dusttherepa'st- In order to readily mount my shield or hood, the same ispreferably made in four sections, corresponding to the number of plicityof language they have 'been spoken This form is espe-" of as singlemembers. cially intended for a dry rubbing'contact.

In the lubricated form of the device shown in Fig. l, I provide a doublechannel'ed ring 15 having outer and inner concentric channels 16 and 17,the inner channel 16opening onto the shield 5 and having therein feltstrip or gasket 18 bearing on the shieldfi, and the outer channel 17having a felt ring 19 projecting therebeyond.

' The member 15 is provided with opposed flanges 20 which bear on theshield 5, the purpose of the. gasket18 being to make a dust-ti 'htfit'b'etween the channel member and the. shield 5.

.a relative thereto. 1

- The member 15 is preferably made in two equalsized-sections, eachone-half a circle, the abutting ends being provided with radial flanges21 adapted to be clamped. together bOltS 22. j

The member 19: projects into a channel 23 formed by the inner flange 24of a hood 25 concentric with the shield 5, and by a flange 26 parallelto the flange 24 but adjustable Themember 19 does not fill this channel,but leaves a peripheral space therebeyond for the reception of alubricating substance. The flange '26 however is moved to bear againstthe felt with a pressure suflicient to preclude the escape of thelubricant therepast. The hood 25 beyond the channel bends toward thegear as at 27 to join the ring orv flange 6 which holds a gasket 8 inthe same manner as the ring 6, it being of course understood that thehood and portion 27 form a solid surface throughout their extent, andthat they are also made in sections mounted to the bull-gearin thesame 1manner as the first described form.

It will be noted that while in the first described form the main feltring 12 moves with the bull-gear and bears dry against the stationaryshield. 5, in the latter described type the main felt ring 19 isstationary, while the lubricant-filled channel formed with the hoodrevolves thereabout. H In the latter type, the abutting ends of theouter channel are covered by overlapping and removably secured plates orstrips (not shown), preferably having alining of felt, soastoprevent'the escape of the lubricant between such ends.

From theforegoing description it will be readily seen that I haveproduced such a device'as substantially fulfilsthe objects of theinvention as set forth herein. While this specification sets forth indecure by Letters Patent is tail'the present and preferred constructionof the device, still in practice such deviations from such detail may beresorted to as do-not forma departure'from the spirit of the'inven'tion, as defined by the appended claims. j j V Having thusdescribed my invention, what I claim as new and useful anddesire tose- 1. A dust shield for tractor bull-gears comprising in combinationwith a stationary hood projecting partly over the gear and spaced .fromthe outer periphery thereof, a hood overlapping the first namedhood andspaced. therefrom, such hood comprising a plurality of sectionsto form acomplete cir- V cumferenc e and fixed to thegear beyond the first namedhood, and a packing ring between the inner and outer hoods at theiroverlapping portions, such ring being made in sections to'correspond tothe sections of v the outer hood.

2. A dust shield for tractor-bull gears comprising in combination with astationary hood projecting partly; over the gear and spaced from the'outer periphery thereof, a hood overlapping the first named hood andspaced therefrom, suchhood comprising a' plurality of sections to form acomplete circumference andfixed to the gear beyondthe first named hood,and a packing ring fixed to each section and bearing on theouterfaceofthe inner hood. f 7 3. A dust shield for, tractor-bull gearscomprisingin combinationwith a stationary hood projectingpartly over thegear "and spaced from the outer periphery thereof, a hood overlappingthe firstnamed hood and spaced therefrom, such hood comprising aplurality of sections to form a complete circumference and fixed to thegear beyond the first named hood, a packing gasket between the outerhood and the gear, and a packing ring between the overlapping portionsof the inner and outer hoods.

A}. A dust shield for tractor-bull gears comprising in combination witha stationary hood projecting partlyover the gear and spaced from theouter periphery thereof, a hood fixed to the gear beyond the first namedhood, and projectingthereover, a channel formed with the outer hoodconcentric. with the inner hood and open thereto ward, and a packingring clamped about the inner hood and projecting into the channel, andspaced from the outer face thereof, whereby a lubrispaced-from the outerperiphery thereof, a

hood fixed to thegear'beyond the first named hood. and projectingthereover,- a channel formed with the outer hood concentric with the,inner hoodand open theretoward, and

a packing ring clamped about the inner hood and projecting into thechannel, one of the sides of said channel being adjustable whereby thefrictional contact of the ring therewith may be varied.

6. A dust shield for tractor-bull gears comprising in combination with astationary hood projecting partly over the gear and spaced from theouter periphery thereof, a hood fixed to the gear beyond the first namedhood and projecting thereover, a channel formed with the outer hoodconcentric with the inner hood and open theretoward, a double-channeledmember formed of sections to make a complete circumference and adaptedto be clamped about the inner hood, one of the channels of said memberopening toward the inner hood and the other toward the outer hood, agasket in the inner channel bearing on the adjacent hood, and a packingring fixed in the outer channel and projecting into the channel in theouter hood, and spaced from the outer face thereof, such channels beingin alinement.

In testimony whereof I aflix my signature.

JAY L. GOODWIN.

